Question

我需要创建一个UITableView，其中UITableViewCell包含两个UILabel，其中一个应该适合其内容NSString的高度。 UILabel的宽度是固定的，行数设置为0.如何获得高度？我看到这样的代码：

CGSize maximumSize = CGSizeMake(300, 9999);
NSString *myString = @"This is a long string which wraps";
UIFont *myFont = [UIFont fontWithName:@"Helvetica" size:14];
CGSize myStringSize = [myString sizeWithFont:myFont 
                           constrainedToSize:maximumSize 
lineBreakMode:self.myLabel.lineBreakMode];

但结果是：UILabel中只有一个字符。为什么我不能使用这种方法？非常感谢你！

Answer 1

试试这个

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *str = @"This is a very very long string which wraps";
    CGSize size = [str sizeWithFont:[UIFont fontWithName:@"Helvetica" size:17] constrainedToSize:CGSizeMake(280, 999) lineBreakMode:UILineBreakModeWordWrap];
    return size.height + 10;
}

Answer 2

我终于让它工作了，代码在我的项目中：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"shopmessage";
UITableViewCell *cell;
cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (!cell) {
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}

UILabel* content = (UILabel*)[cell viewWithTag:11];
UILabel* date = (UILabel*)[cell viewWithTag:12];
NSDictionary* msg = [ _msglist objectAtIndex:indexPath.row];
NSString* type = [[msg objectForKey:@"msgtype"] intValue] == 0 ? @"我:":@"店家:";
[content setText:[NSString stringWithFormat:@"%@%@",type,[msg objectForKey:@"sendmsg"]]];
[date setText:[msg objectForKey:@"sendtime"]];

CGSize contentsize = [content.text sizeWithFont:[UIFont systemFontOfSize:17] constrainedToSize:CGSizeMake(280, 1000) lineBreakMode:UILineBreakModeWordWrap];
//    content.frame.size = contentsize;
content.frame = CGRectMake(content.frame.origin.x, content.frame.origin.y, contentsize.width, contentsize.height);

[date setText:[msg objectForKey:@"sendtime"]];
//    date.frame.origin = CGPointMake(date.frame.origin.x, content.frame.origin.y + content.frame.size.height + 10);
date.frame = CGRectMake(date.frame.origin.x, content.frame.origin.y + content.frame.size.height, date.frame.size.width, date.frame.size.height);
return cell;

}

- (CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSDictionary* msg = [ _msglist objectAtIndex:indexPath.row];
    NSString* text =[msg objectForKey:@"sendmsg"];
    CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:17] constrainedToSize:CGSizeMake(280, 1000) lineBreakMode:UILineBreakModeCharacterWrap];

    return size.height + 30;
}

参考：Apple Support Communities

如何在UITableView中将UILabel的高度设置为包含可变长度的NSString

2 个答案: